What Causes Pain Under Right Arm While Using Symbicort For Mild Emphysema?

I have developed allergies in recent years after moving to Fort Lauderdale, Florida 22 years ago. I started allergy shots three years ago and have had some improvement, but I still wheeze and cough more that I used too when I lived in Los Angeles. I have visited a pulmonologist who, after ordering a pulmonary cat scan, diagnosed a touch of emphysema and prescribed a inhaler, Symbicort which I use very sparingly. I recently developed a pain under my right arm just forward of the pectorial and it comes and goes, lasting for 10 to 15 seconds. My internist said perhaps I pulled a muscle: however, it feels more like a lung issue and is now on my left side as well. What are your thoughts about my condition